BEIJING – Anguished relatives of the 239 people aboard the Malaysia Airlines jet that vanished after taking off from Kuala Lumpur were preparing Sunday to travel closer to the presumed crash site off the southern tip of Vietnam.

Distraught and frustrated, many relatives demanded the airline release more information regarding Beijing-bound Flight MH370, which disappeared early Saturday with passengers and crew from 14 nations.

The airline warned relatives Sunday "to expect the worst," but one Chinese family clung to faint hope that their loved one isn't dead: the sound of a ringing cellphone.

"This morning, around 11:40, I called my older brother's number twice, and I got the ringing tone," said Bian Liangwei, from Dingzhou in north China's Hebei Province. At 2 p.m., Bian rang again and heard it ringing once more.

"If I could get through, the police could locate the position, and there's a chance he could still be alive," said Bian, who passed the number to Chinese police and Malaysia Airlines.

More than 100 family members of passengers have gathered at the Beijing Lido Hotel, one of three hotels in the Chinese capital where the airline has supplied rooms. "The airline people are better now than they were Saturday, they give us more information about the plane, provide some things we need and always escort us," said Zhang Hongjie, whose wife, Zheng Ruixian, was on the flight.

The multination search for the plane has yielded little to date. A low-flying plane on Sunday spotted an object in waters off Vietnam that could be debris from the site, but no official determination had been made, authorities said.

Once the location is determined, Malaysia Airlines will set up a response control center either in Kota Bharu, Malaysia's northernmost major city, or in Vietnam, Ignatius Ong, an airline representative, told a news conference Sunday in Beijing. Vietnam is setting up a command center in Phu Quoc.

The airline will fly two family members for each missing passenger to Kuala Lumpur, the Malaysian capital, or another destination if it is closer to the plane's location. Efforts by Chinese authorities to fast-track passports for relatives who lack them appeared to succeed, as some relatives reported receiving passports Sunday, when Beijing's passport office is closed, within hours of applying.

French police officers inspect a piece of debris from a plane in Saint-Andre, Reunion Island. Air safety investigators, one of them a Boeing investigator, have identified the component as a "flaperon" from the trailing edge of a Boeing 777 wing. Lucas Marie, AP

A piece of airplane debris washed up on Reunion Island in the Pacific. Air safety investigators, one of them a Boeing investigator, identified the component as a "flaperon" from the trailing edge of a Boeing 777 wing. AP

Members of French Gendarmerie and local authorities check a piece of debris from an unidentified aircraft apparently washed ashore in Saint-Andre de la Reunion, eastern La Reunion island, France. ZINFOS974, EPA

Family members of passengers on the missing Malaysia Airlines jet rest on March 1 after praying at a temple in Kuala Lumpur, Malaysia. Malaysia Airlines Flight 370 vanished last year on a flight from Kuala Lumpur to Beijing with 239 people on board. No trace of the plane has been found. Vincent Thian, AP

Wang Zheng looks at the work room of his father, Wang Linshi, who along with his wife, Xiong Deming, was a passenger on the missing Malaysia Airlines jet on Feb. 24 at an apartment in Nanjing, China. Zheng said he only comes into the apartment when absolutely necessary. Peng Peng, AP

A relative of a passenger abaoard the missing Malaysia Airlines jet displays a photograph of Malaysian Prime Minister Najib Razak with the words, "Please bring back my husband," on Jan. 29 in Putrajaya. The 239 passengers and crew on the missing airliner have been declared dead and their disappearance on March 8, 2014, was formally declared an accident. AFP/Getty Images

Parents whose son was on the missing airliner demand the Malaysian government continue the search for the Malaysia Airlines flight near the Malaysian Embassy in Beijing. The poster reads, "Malaysia Airlines, return my relative to me." Andy Wong, AP

Jiang Hui, left, and Dai Shuqin, relatives of passengers on the Malaysia Airlines flight, react after watching a pre-recorded message from Malaysia's Civil Aviation Authority on a laptop in Beijing. Malaysian officials declared the crash of Flight 370 an accident.This clears the way for families to seek compensation, as the plane remains missing. Andy Wong, AP

A photograph released on April 15 shows operators aboard the ADF Ocean Shield prepare to launch a U.S. Navy Bluefin-21 robotic submarine to search for the missing Malaysia Airlines jet in the Indian Ocean. U.S. Navy MC1 Peter D. Blair via AFP/Getty Images

A Royal Australian Air Force AP-3C Orion aircraft flies over the Australian Defense Force vessel Ocean Shield during a search for the missing Malaysia Airlines jet on April 9 in the southern Indian Ocean. The ship has detected two new underwater signals that may be emanating from the aircraft's black boxes. The Boeing 777 with 239 people on board disappeared on March 8. LSIS Bradley Darvill, Australian Defense Force, via AP

Japanese and Malaysian officials watch the departure of a Japanese Maritime Self Defense Force P3C plane at Subang airbase near Kuala Lumpur, Malaysia. The plane is flying to Australia to join the search for the missing airliner. Ahmad Yusni, epa

Australian navy Able Seaman Clearance Divers Michael Arnold, left, and Matthew Johnston from the ship ADV Ocean Shield scan the water for debris from the missing jet on April 7 in the southern Indian Ocean. Lt. Ryan Davis, AFP/Getty Images

A Royal Malaysia Air Force C-130 takes off on a search mission for a missing Malaysia Airlines Boeing 777 jet on April 3 from Pearce air force base in Perth, Australia. The airliner with 239 people on board disappeared on March 8 on a flight from Kuala Lumpur to Beijing. Pool photo by Rob Griffith

A crew member aboard a Royal New Zealand Air Force P3 Orion aircraft searches for debris from the missing Malaysia Airlines jet on April 2 over the Indian Ocean northwest of Perth, Australia. The Boeing 777 airliner with 239 people on board disappeared on March 8 on a flight from Kuala Lumpur to Beijing. Pool photo by Kim Christian EPA

Malaysia's civil aviation chief Azharuddin Abdul Rahman, left, speaks to the media after a private meeting with Chinese relatives of the passengers on the missing Malaysia Airlines jet at a hotel in Bangi near Kuala Lumpur. Joshua Paul, AP

Japan Coast Guard crewman Koji Kubota searches for debris from the missing Malaysia Airlines jet on April 1 near Perth, Australia. Ten planes and nine ships are searching for the missing Boeing 777 that disappeared on March 8. Pool photo by Paul Kane

A picture on a monitor shows a piece of unknown debris spotted by a Royal New Zealand P-3 Orion during a search operation for the missing Malaysia Airlines jet on March 31 in the southern Indian Ocean. The images were sent for analysis to the Rescue Coordination Center and Australian Maritime Safety Authority. Pool photo by Rob Griffith

A relative of a Chinese passenger on the missing jet prays before a briefing with Malaysian officials at a hotel in Beijing. The Boeing 777 disappeared on March 8 on a flight from Kuala Lumpur to Beijing. Alexander F. Yuan, AP

South Korean Navy Lieutenant Commander Oh Kang-Min wears a MH370 search-and-rescue team patch as he waits to meet Australian Prime Minister Tony Abbott at an air base in Perth, Australia. Pool photo by Jason Reed

A Royal Australian Air Force ground crewman stands in front of a Royal Malaysian Air Force C-130 Hercules after it landed at RAAF Base Pearce on March 29 to help with the search for the missing Malaysia Airlines Flight 370 in Perth, Australia. Rob Griffith, AP

Chinese relatives of passengers on the missing Malaysia Airlines Flight 370 observe a moment of silence before a meeting with Malaysian officials at the Metro Park Hotel in Beijing. Goh Chai Hin, AFP/Getty Images

An Royal Australian Air Force aircraft takes off on a search mission for the missing Malaysia Airlines jet from Pearce Airbase on March 28 in Bullsbrook. Planes and ships raced to a new search zone after investigators suggested the missing Boeing 777 was flying faster than first thought before it plunged into the Indian Ocean. Greg Wood, AFP/Getty Images

Chinese relatives of passengers on the missing Malaysia Airlines fligh pray in a room at the Metro Park Lido Hotel in Beijing. The airliner with 239 people on board disappeared on a flight from Kuala Lumpur to Beijing on March 8. Mark Ralston, AFP/Getty Images

Royal Australian Air Force Flight Lt. Jayson Nichols looks at a map as he flies aboard an AP-3C Orion aircraft during a search operation for the missing Malaysia Airlines jet over the southern Indian Ocean. Pool photo by Michael Martina

A Thaichote satellite image taken on March 24 and released March 27 by the Geo-Informatics and Space Technology Development Agency shows objects floating in the Indian Ocean near the search area for the missing jet. GSTDA via AP

A Malaysian air force general reacts as he answers a question from a relative of a passenger on a missing Malaysia Airlines jet during a meeting at the Metro Park Lido Hotel in Beijing. The relatives were told that they would be brought to the recovery area as the search goes on for wreckage. Wang Zhao, AFP/Getty Images

A satellite from the Malaysian Remote Sensing Agency taken on March 23 shows the location of unknown objects in the southern Indian Ocean off the southwestern coast of Perth, Australia. A Malaysia Airlines jet with 239 people on board disappeared on March 8 on a flight from Kuala Lumpur to Beijing. MRSA via Getty Images

Malaysian Minister of Defense and acting Transport Minister Hishammuddin Hussein shows pictures of possible debris from the missing Malaysia Airlines jet on March 26 at the Putra World Trade Center in Kuala Lumpur. The Boeing 777 with 239 people on board disappeared on March 8 on a flight from Kuala Lumpur to Beijing. Mohd Rasfan, AFP/Getty Images

High school students attend a vigil for passengers aboard the missing Malaysia Airlines jet in Lianyungang, China. The Boeing 777 airliner disappeared on March 8 on a flight from Kuala Lumpur to Beijing. AFP/Getty Images

A grieving Chinese relative yells at journalists during a protest outside the Malaysian Embassy. Angry relatives of the Chinese passengers aboard the missing Boeing 777 marched to the Malaysian Embassy in Beijing to demand more answers about the crash. Mark Ralston, AFP/Getty Images

Grieving relatives of passengers on the missing Malaysia Airlines flight leave a hotel ballroom in Beijing on March 24 after being told the plane plunged into Indian Ocean. Goh Chai Hin, AFP/Getty Images

A relative of a passenger aboard the missing Malaysia Airlines jet cries at a hotel in Beijing after hearing the news that the plane crashed into the sea. Malaysian Prime Minister Najib Razak announced the jet crashed into the Indian Ocean on March 8 and none of the passengers survived. Goh Chai Hin, AFP/Getty Images

Malaysian Prime Minister Najib Razak leaves after a news conference in Kuala Lumpur. He said analysis of available satellite data has concluded that the missing plane's final position was in the southern Indian Ocean. Rahman Roslan, Getty Images

A woman reads messages dedicated to passengers aboard a missing Malaysia Airlines jet at a shopping mall in Kuala Lumpur, Malaysia. The Boeing 777 aircraft with 239 people on board disappeared on March 8. AP

A ground controller guides a Royal Australian Air Force AP-3C Orion aircraft after it returned from a search mission for the missing Malaysia Airlines jet at a base in Pearce, Australia. Pool photo by Jason Reed

Members of Japan's disaster-relief team wave at a Japanese Maritime Self-Defense Force Lockheed P-3C Orion aircraft as it prepares to take off on a search mission for the missing Malaysia Airlines jet from a Royal Australian Air Force base in Pearce, Australia. Jason, Reed, AFP/Getty Images

A Royal Australian Air Force AP-3C Orion search plane passes over the Norwegian car transport ship Hoegh St. Petersburg during a search for the missing Malaysia Airlines jet on March 21 in the Indian Ocean. The Boeing 777 aircraft with 239 people on board disappeared on March 8 on a flight from Kuala Lumpur to Beijing. Pool photo by Justin Benson-Cooper

Relatives of Chinese passengers aboard the missing Malaysia Airlines jet watch a television news program about the aircraft at a hotel ballroom on March 20 in Beijing. The Boeing 777 jetliner with 239 people on board vanished on March 8 on a flight from Kuala Lumpur to Beijing. Andy Wong, AP

Royal Australian Air Force Loadmasters, Sergeant Adam Roberts, left, and Flight Sergeant John Mancey toss a Self Locating Data Marker Buoy from a C-130J Hercules during a search for the missing Malaysia Airlines aircraft in the southern Indian Ocean. Pool photo by Leading Seaman Justin Brown

Two satellite images from DigitalGlobe taken on March 16 and released on March 20 by the Australian Maritime Safety Authority show large objects drifting in the Indian Ocean. The largest object is estimated to be 79 feet long. Australian Maritime Safety Authority via AFP/Getty Images

A Chinese woman who had relatives aboard the missing Malaysia Airlines Flight 370 covers her face in frustration as she leaves a daily briefing with airline managers on March 19 in Beijing. Two hundred thirty-nine people are missing after the Boeing 777 disappeared on March 8 on a flight from Kuala Lumpur to Beijing. Alexander F. Yuan, AP

Acting Malaysia Transport Minister Hishamuddin Hussein displays a map of the northern search corridor during a news conference on the missing Malaysia Airlines jet at a hotel near the Kuala Lumpur International Airport on March 17 in Sepang. A Boeing 777 jet with 239 people on board disappeared on March 8. Vincent Thian, AP

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The first flight for relatives who want to travel to Kuala Lumpur will be Monday, said Ong, while arrangements will continue for those who decide to wait in Beijing. But many relatives remained angry Sunday at the still-limited information available, after receiving very little news Saturday.

More than 80 relatives, after a midafternoon meeting with airline representatives, signed a petition demanding the airline "announce the truth of this incident" by 5 p.m., or they would go to "make representations" at the Malaysian Embassy.

"I will definitely go to that place, when the plane is found," said Zhang Hongjie, 44, who has no passport, and signed the petition Sunday. His 18-year-old daughter18 is "very sad and anxious," Zhang said.

As speculation centers on whether two passengers were using stolen passports, Zhang said "it could be a terrorist incident," when told about the reports.

Ong, from the airline, said boarding was allowed because those names matched up on the passenger list, itinerary and passports.

No sign of missing Malaysia Airlines plane more than 24 hours on but questions arise over passenger identities. Paul Chapman reports. Video provided by Reuters
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The 153 Chinese nationals on board ranged from celebrated painters and calligraphers to telecom business people, tourists, builders and at least one man who dreamed of becoming a dentist. Bian Liangwei's brother Bian Liangjing, 26, defied the rough, rural stereotype of Chinese migrant workers.

A dentistry graduate of the medical college in Hebei's provincial capital, Shijiazhuang, Bian Liangjing was among several Dingzhou natives who left one year ago for their first experience of manual labor overseas. Leaving behind his wife and infant daughter, Bian bent steel for cement pillars on a Singapore building site, for a $1,500 monthly wage, said his brother.

"He wanted to earn some money first, as it's expensive to set up a dentist's clinic in China," said Bian Liangwei.

The brothers last spoke at Chinese New Year in February, when the elder Bian chided the younger for spending money on a call, instead of free texting via social media. "Don't worry, it's good here and my job is not tiring," claimed Bian Liangjing of his tough duties in hot and humid Singapore.

The younger Bian wanted to keep calling his brother Sunday, but feared it would run down the battery of his sibling's phone. Malaysia Airlines' Ong said he had tried the number several times himself, and passed the number to the Chinese government.

When Bian heard a false report that the airline said his cellphone connection was a "rumor," Bian and his uncle cursed loudly — and stormed off to find airline staff.